“Yes, Louise and I saw Webb working on one of them there. Evidently it was the one the professor exploded tonight.”
“He must have doctored it in some special way. Probably an untampered mine won’t explode.”
“He’ll fix Mr. Johnson’s mine the same way, and then the test will appear successful.”
Salt nodded gloomily. He was lost in thought for several minutes, and then he grinned.
“Maybe I have an idea!”
“What is it, Salt?”
The photographer switched on the car ignition. “Wait until Thursday night,” he replied. “Can you get away from the office early?”
“Well, I really shouldn’t—”
“I’ll take care of that part,” Salt said briskly. “Just sit tight, Penny. You and I will have some fun out of this affair yet, and maybe we’ll save Mr. Johnson a tidy sum of money.”